forked from Minki/linux
gpio: xra1403: Add EXAR XRA1403 SPI GPIO expander driver
This driver support basic XRA1403 functionalities:
- set gpio direction
- get gpio direction
- set gpio high/low
- get gpio status
Signed-off-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Semi Malinen <semi.malinen@ge.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Nandor Han
Linus Walleij
parent
7808c42b40
commit
5704520d78
@ -1225,6 +1225,11 @@ config GPIO_PISOSR
|
||||
GPIO driver for SPI compatible parallel-in/serial-out shift
|
||||
registers. These are input only devices.
|
||||
|
||||
config GPIO_XRA1403
|
||||
tristate "EXAR XRA1403 16-bit GPIO expander"
|
||||
help
|
||||
GPIO driver for EXAR XRA1403 16-bit SPI-based GPIO expander.
|
||||
|
||||
endmenu
|
||||
|
||||
menu "SPI or I2C GPIO expanders"
|
||||
|
||||
@ -141,6 +141,7 @@ obj-$(CONFIG_GPIO_XGENE) += gpio-xgene.o
|
||||
obj-$(CONFIG_GPIO_XGENE_SB) += gpio-xgene-sb.o
|
||||
obj-$(CONFIG_GPIO_XILINX) += gpio-xilinx.o
|
||||
obj-$(CONFIG_GPIO_XLP) += gpio-xlp.o
|
||||
obj-$(CONFIG_GPIO_XRA1403) += gpio-xra1403.o
|
||||
obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o
|
||||
obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
|
||||
obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o
|
||||
|
||||
237
drivers/gpio/gpio-xra1403.c
Normal file
237
drivers/gpio/gpio-xra1403.c
Normal file
@ -0,0 +1,237 @@
|
||||
/*
|
||||
* GPIO driver for EXAR XRA1403 16-bit GPIO expander
|
||||
*
|
||||
* Copyright (c) 2017, General Electric Company
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/gpio/driver.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/of_device.h>
|
||||
#include <linux/of_gpio.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/regmap.h>
|
||||
|
||||
/* XRA1403 registers */
|
||||
#define XRA_GSR 0x00 /* GPIO State */
|
||||
#define XRA_OCR 0x02 /* Output Control */
|
||||
#define XRA_PIR 0x04 /* Input Polarity Inversion */
|
||||
#define XRA_GCR 0x06 /* GPIO Configuration */
|
||||
#define XRA_PUR 0x08 /* Input Internal Pull-up Resistor Enable/Disable */
|
||||
#define XRA_IER 0x0A /* Input Interrupt Enable */
|
||||
#define XRA_TSCR 0x0C /* Output Three-State Control */
|
||||
#define XRA_ISR 0x0E /* Input Interrupt Status */
|
||||
#define XRA_REIR 0x10 /* Input Rising Edge Interrupt Enable */
|
||||
#define XRA_FEIR 0x12 /* Input Falling Edge Interrupt Enable */
|
||||
#define XRA_IFR 0x14 /* Input Filter Enable/Disable */
|
||||
|
||||
struct xra1403 {
|
||||
struct gpio_chip chip;
|
||||
struct regmap *regmap;
|
||||
};
|
||||
|
||||
static const struct regmap_config xra1403_regmap_cfg = {
|
||||
.reg_bits = 7,
|
||||
.pad_bits = 1,
|
||||
.val_bits = 8,
|
||||
|
||||
.max_register = XRA_IFR | 0x01,
|
||||
};
|
||||
|
||||
static unsigned int to_reg(unsigned int reg, unsigned int offset)
|
||||
{
|
||||
return reg + (offset > 7);
|
||||
}
|
||||
|
||||
static int xra1403_direction_input(struct gpio_chip *chip, unsigned int offset)
|
||||
{
|
||||
struct xra1403 *xra = gpiochip_get_data(chip);
|
||||
|
||||
return regmap_update_bits(xra->regmap, to_reg(XRA_GCR, offset),
|
||||
BIT(offset % 8), BIT(offset % 8));
|
||||
}
|
||||
|
||||
static int xra1403_direction_output(struct gpio_chip *chip, unsigned int offset,
|
||||
int value)
|
||||
{
|
||||
int ret;
|
||||
struct xra1403 *xra = gpiochip_get_data(chip);
|
||||
|
||||
ret = regmap_update_bits(xra->regmap, to_reg(XRA_GCR, offset),
|
||||
BIT(offset % 8), 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = regmap_update_bits(xra->regmap, to_reg(XRA_OCR, offset),
|
||||
BIT(offset % 8), value ? BIT(offset % 8) : 0);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int xra1403_get_direction(struct gpio_chip *chip, unsigned int offset)
|
||||
{
|
||||
int ret;
|
||||
unsigned int val;
|
||||
struct xra1403 *xra = gpiochip_get_data(chip);
|
||||
|
||||
ret = regmap_read(xra->regmap, to_reg(XRA_GCR, offset), &val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return !!(val & BIT(offset % 8));
|
||||
}
|
||||
|
||||
static int xra1403_get(struct gpio_chip *chip, unsigned int offset)
|
||||
{
|
||||
int ret;
|
||||
unsigned int val;
|
||||
struct xra1403 *xra = gpiochip_get_data(chip);
|
||||
|
||||
ret = regmap_read(xra->regmap, to_reg(XRA_GSR, offset), &val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return !!(val & BIT(offset % 8));
|
||||
}
|
||||
|
||||
static void xra1403_set(struct gpio_chip *chip, unsigned int offset, int value)
|
||||
{
|
||||
int ret;
|
||||
struct xra1403 *xra = gpiochip_get_data(chip);
|
||||
|
||||
ret = regmap_update_bits(xra->regmap, to_reg(XRA_OCR, offset),
|
||||
BIT(offset % 8), value ? BIT(offset % 8) : 0);
|
||||
if (ret)
|
||||
dev_err(chip->parent, "Failed to set pin: %d, ret: %d\n",
|
||||
offset, ret);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
static void xra1403_dbg_show(struct seq_file *s, struct gpio_chip *chip)
|
||||
{
|
||||
int reg;
|
||||
struct xra1403 *xra = gpiochip_get_data(chip);
|
||||
int value[xra1403_regmap_cfg.max_register];
|
||||
int i;
|
||||
unsigned int gcr;
|
||||
unsigned int gsr;
|
||||
|
||||
seq_puts(s, "xra reg:");
|
||||
for (reg = 0; reg <= xra1403_regmap_cfg.max_register; reg++)
|
||||
seq_printf(s, " %2.2x", reg);
|
||||
seq_puts(s, "\n value:");
|
||||
for (reg = 0; reg < xra1403_regmap_cfg.max_register; reg++) {
|
||||
regmap_read(xra->regmap, reg, &value[reg]);
|
||||
seq_printf(s, " %2.2x", value[reg]);
|
||||
}
|
||||
seq_puts(s, "\n");
|
||||
|
||||
gcr = value[XRA_GCR + 1] << 8 | value[XRA_GCR];
|
||||
gsr = value[XRA_GSR + 1] << 8 | value[XRA_GSR];
|
||||
for (i = 0; i < chip->ngpio; i++) {
|
||||
const char *label = gpiochip_is_requested(chip, i);
|
||||
|
||||
if (!label)
|
||||
continue;
|
||||
|
||||
seq_printf(s, " gpio-%-3d (%-12s) %s %s\n",
|
||||
chip->base + i, label,
|
||||
(gcr & BIT(i)) ? "in" : "out",
|
||||
(gsr & BIT(i)) ? "hi" : "lo");
|
||||
}
|
||||
}
|
||||
#else
|
||||
#define xra1403_dbg_show NULL
|
||||
#endif
|
||||
|
||||
static int xra1403_probe(struct spi_device *spi)
|
||||
{
|
||||
struct xra1403 *xra;
|
||||
struct gpio_desc *reset_gpio;
|
||||
int ret;
|
||||
|
||||
xra = devm_kzalloc(&spi->dev, sizeof(*xra), GFP_KERNEL);
|
||||
if (!xra)
|
||||
return -ENOMEM;
|
||||
|
||||
/* bring the chip out of reset if reset pin is provided*/
|
||||
reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
|
||||
if (IS_ERR(reset_gpio))
|
||||
dev_warn(&spi->dev, "Could not get reset-gpios\n");
|
||||
|
||||
xra->chip.direction_input = xra1403_direction_input;
|
||||
xra->chip.direction_output = xra1403_direction_output;
|
||||
xra->chip.get_direction = xra1403_get_direction;
|
||||
xra->chip.get = xra1403_get;
|
||||
xra->chip.set = xra1403_set;
|
||||
|
||||
xra->chip.dbg_show = xra1403_dbg_show;
|
||||
|
||||
xra->chip.ngpio = 16;
|
||||
xra->chip.label = "xra1403";
|
||||
|
||||
xra->chip.base = -1;
|
||||
xra->chip.can_sleep = true;
|
||||
xra->chip.parent = &spi->dev;
|
||||
xra->chip.owner = THIS_MODULE;
|
||||
|
||||
xra->regmap = devm_regmap_init_spi(spi, &xra1403_regmap_cfg);
|
||||
if (IS_ERR(xra->regmap)) {
|
||||
ret = PTR_ERR(xra->regmap);
|
||||
dev_err(&spi->dev, "Failed to allocate regmap: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = devm_gpiochip_add_data(&spi->dev, &xra->chip, xra);
|
||||
if (ret < 0) {
|
||||
dev_err(&spi->dev, "Unable to register gpiochip\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
spi_set_drvdata(spi, xra);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id xra1403_ids[] = {
|
||||
{ "xra1403" },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, xra1403_ids);
|
||||
|
||||
static const struct of_device_id xra1403_spi_of_match[] = {
|
||||
{ .compatible = "exar,xra1403" },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, xra1403_spi_of_match);
|
||||
|
||||
static struct spi_driver xra1403_driver = {
|
||||
.probe = xra1403_probe,
|
||||
.id_table = xra1403_ids,
|
||||
.driver = {
|
||||
.name = "xra1403",
|
||||
.of_match_table = of_match_ptr(xra1403_spi_of_match),
|
||||
},
|
||||
};
|
||||
|
||||
module_spi_driver(xra1403_driver);
|
||||
|
||||
MODULE_AUTHOR("Nandor Han <nandor.han@ge.com>");
|
||||
MODULE_AUTHOR("Semi Malinen <semi.malinen@ge.com>");
|
||||
MODULE_DESCRIPTION("GPIO expander driver for EXAR XRA1403");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user